Trinidad, on 2011-November-06, 04:42, said:
I think we all agree that any implicit agreement to ask a question or not ask a question is illegal. I would have ruled just as your TD in this case.
Aquahombre asks for a better example to discuss UI from lack of a question. Perhaps 1NT-(2♦!)-3NT would be one. The responder has "conveyed information" that he does not care what 2♦ shows; he still wants to play in 3NT. A different hand might have asked, found that 2D was multi-landy, and now been able to show 4 hearts or 4 spades with a stop in the other major.
Is the information that the 3NT bidder either knows what 2♦ is and still wants to bid 3NT or does not care what 2♦ is and still wants to bid 3NT authorised? It derives from the legal calls and plays of the current board and is unaffected by unauthorized information from another source, one could argue, if the failure to ask a question (other than as an implicit agreement) is authorised.